Abstract
The combination of capillary liquid chromatography, temperature gradient and on-column focusing with large injection volumes offers a powerful tool for the determination of very low concentrations of triazines and their degradation products when very polar degradation products are present. A temperature gradient from subambient temperatures up to 70°C allows separation of eight triazines in 24 min. The focusing step makes it possible to increase 50 times the sample volume that can be injected into a capillary column. Detection limits (3×noise) are improved by a factor between 50 and 125 to 9 ng l −1 for hydroxyatrazine and 45 ng l −1 for atrazine. The chromatographic method, combined with solid phase extraction, was applied to the determination of eight triazines in ground water.
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